6. Ford Fiesta Ecoboost
Official EPA fuel economy estimates: 32/45/37. When it comes to using a tiny engine and advanced engineering, Ford brings one of the most impressive examples with the 1.0-liter Ecoboost engine. The little three-cylinder power plant gives the Fiesta an unexpectedly feisty attitude, thanks to the turbo system. Driving the car more conservatively provides a reward of its own, returning fuel economy that outclasses many hybrid cars on the market today, and highway MPGs that are higher than any non-hybrid vehicle to have been tested by the EPA.